The experiments described in the report are a continuation of field studies of repellent or insecticide treated mesh clothing items conducted at DREO between 1975 and 1977. Several small tests were carried out at Canadian Forces Base Petawawa to evaluate various mesh jackets with hoods, or separate hoods, against adult mosquitoes or blackflies. The items had been treated with diethyltoluamide, a repellent, or permethrin, an insecticide.